That Seems Cost Effective.

The last time he was in hospital the battery on my father's iPhone 3G finally died.

Which seemed like a good opportunity to use the iPhone 5 he's had sitting around for years.

That though would require him to order a micro SIM card.

So instead he went out and brought a second hand iPhone X. Which also requires a micro SIM card.

Prompting him to cut his SIM down to size.